. If you could put a sealed room on a very sensitive scale and open a thousand soft drink
1 answer:
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Make a system of equations.
Re-arrange the 2nd equation:
Subtract y to both sides:
Plug in -y + 22 for 'x' in the first equation.
Subtract 3y to both sides:
Subtract 22 to both sides:
Divide -4 to both sides:
Plug this into any of the two equations to find 'x':
Subtract 5 to both sides:
So one of the numbers is 5 and one of them is 17.
Re-arrange the 2nd equation:
Subtract y to both sides:
Plug in -y + 22 for 'x' in the first equation.
Subtract 3y to both sides:
Subtract 22 to both sides:
Divide -4 to both sides:
Plug this into any of the two equations to find 'x':
Subtract 5 to both sides:
So one of the numbers is 5 and one of them is 17.
Answer:
x = 4
Step-by-step explanation:
Given
= 5 ( multiply both sides by 3 to clear the fraction )
7 + 2x = 15 ( subtract 7 from both sides )
2x = 8 ( divide both sides by 2 )
x = 4